Enable SPI flash support for AM62DX EVM by adding Cadence QSPI driver,
configuring 25MHz speed, and enabling SFDP support with Spansion
S28HX-T flash compatibility. Enable required SPI and MTD configs for
both A53 and R5 configurations to allow booting from SPI flash.

Signed-off-by: Paresh Bhagat <p-bhagat@ti.com>

Add initial support for AM62D2-EVM, Kconfig entries for binman, SPL,
base DTS files for u-boot and SPL, HS-SE and HS-FS support and initial
configs with SD-MMC, UART, eMMC and OSPI boot providing a baseline for
further enablement.

Also add labels and targets to AM62A-SK binman to enable AM62D2-EVM
builds to reuse existing binman infrastructure.

Technical Reference Manual - https://www.ti.com/lit/pdf/sprujd4
Schematics Link - https://www.ti.com/lit/zip/sprcal5

Signed-off-by: Paresh Bhagat <p-bhagat@ti.com>